The world's largest concentration of <a href="http://inhabitat.com/treehouses/">treehouses</a> is found in Cave Junction, Oregon, where builder Michael Garnier has built a treetop metropolis at the <a href="http://www.treehouses.com/index.cfm">Out'n'About Treehouse Treesort</a>. "I think it fits in with the state of Oregon perfectly," says Garnier in a video produced by <a href="http://youtu.be/K7aVLMZvNEQ">FairCompanies</a>. "That's part of what this environment is, it's part of what Oregon is -- it's tree-ific, it's tree-mendous."

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Out'n'About Treesort

The treehouses at the Out'n'About Treesort are connected by a series of catwalks high in the trees.
Photo by Flickr user <a href="http://www.flickr.com/photos/faircompanies/">nicolas.boullosa</a>

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Out'n'About Treesort

In addition to the full-service rooms, the 'treesort' also features several other treehouse-style structures, like this 'treezebo'.
Photo by Flickr user <a href="http://www.flickr.com/photos/faircompanies/">nicolas.boullosa</a>

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Out'n'About Treesort

Many of Garnier's structures are supported by a single tree.
Photo by Flickr user <a href="http://www.flickr.com/photos/faircompanies/">nicolas.boullosa</a>

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Out'n'About Treesort

Others, like the Swiss Family complex, are supported by several different trees and connected by catwalk.
Photo by Flickr user <a href="http://www.flickr.com/photos/faircompanies/">nicolas.boullosa</a>

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Out'n'About Treesort

This treehouse in the Swiss Family complex has a large open-air platform beneath it.

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Out'n'About Treesort

For eight years, Garnier battled Josephine County officials over building codes, and he was ordered to shut down several times.

The Pirate Tree is one of the more rustic treehouses on the property, and it features a ship's wheel.

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Out'n'About Treesort

The Treeloon treehouse is a large treehouse designed by Michael Garnier that looks like an Old West-style saloon and is supported by five small trees.

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Out'n'About Treesort

The tallest treehouse at the Out'n'About Treesort is 37 feet off the ground -- not for the acrophobic!

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Out'n'About Treesort

In some of the taller treehouses at the resort you can feel the trees swaying in the breeze.

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Out'n'About Treesort

At 35 feet, the Forestree has solid walls, heating and 'facilitrees.'

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Out'n'About Treesort

Prices at the Out'n'About Treesort range from $120 to $280 per night.

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Out'n'About Treesort

The world's largest concentration of treehouses is found in Cave Junction, Oregon, where builder Michael Garnier has built a treetop metropolis at the Out'n'About Treehouse Treesort. "I think it fits in with the state of Oregon perfectly," says Garnier in a video produced by FairCompanies. "That's part of what this environment is, it's part of what Oregon is -- it's tree-ific, it's tree-mendous."